Polyalphabetic Cipher C Program

Let us learn how to implement Polyalphabetic cipher in C programming with its algorithm, explanation, output and much more.

What is Polyalphabetic Cipher Algorithm?

A polyalphabetic cipher is a cipher based on substitution concept which uses multiple substitution alphabets.

Alberti Cipher is probably one of the initial ciphers invented by Leon Battista Alberti in around 1467. One of the popular implementations of this cipher algorithm is Vigenere cipher and Playfair cipher.

In this cipher algorithm, a cipher alphabet for the plain-text alphabet may be different at different places during the encryption process.

A popular cross-table called Tabula recta is used to identify elements for encryption and decryption based on Polyalphabetic Substitution Cipher algorithm.

The Polyalphabetic Cipher C program requires two inputs from the end user:

Plaintext

Key value

Advantages

The polyalphabetic substitution is easy to implement

It makes frequency analysis more difficult.

Polyalphabetic Cipher Implementations

There are so many implementations of polyalphabetic substitution cipher algorithm enlisted below: